Components are not limited to medicinal ingredients, but can also
consist of anything else, such as equipment needed to prepare the immunization. For instance, Human diploid cell vaccines (HDCVs) are used to immunize against rabies, so any equipment that might be needed for that process would work.

1 Answer
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What are some elements of the classic zombie's metabolism that we could interfere with?

Dead

Think we'll have to assume this one isn't true. Cell death is exploding cell membranes leaving a big thing of goo roughly shaped like someone you once knew. For zombism to be curable, there still needs to be a person beneath the disease.

No Pulse

Could be your zombie microbe excretes a surfactant(s) that helps keep nutrients flowing in and waste flowing out. An ingredient that disrupt these would be helpful.

Hungry

Could be your zombie microbe also excretes insulin to convert sucrose into glucose for the quick growth of the microbe, and might be one of the key things that maintains the microbes dominance. An insulin suppressor could starve the microbe (and the host) of the biological energy it needs.

Incoherent Rage

Could be the other body chemistry changes send the brain spinning. Some antipsychotics might be effective in giving the host a chance to get a grip.

Penicillin

There may be some magic ingredient, like penicillin that interferes with only the microbes ability to hold it's cell membrane together. Maybe combined with an insulin suppresor to slow growth so that the antibiotic can be effective.

Cardio Stimulator

Nothing is restarting the heart, so your heroes will need to do that.

Bringing It All Together

The zombie microbes circulatory system, a series of chemical surfactants, may act as a barrier to treatment - expelling other treatment agents as soon as their administered. A TBD counter surfactant interferes with the zombie circulatory system resisting treatment. Something that inhibits insulin is administered to slow down the reproduction rate of the microbe. A targetted antibiotic then goes to work killing off the infection. An antipsychotic maybe not only helps the zombie to function, but helps assure chemical signals to the heart are once again being received clearly. At just the right time, the heart is externally restarted with a shock.